function _trimNpmrcFile()

in common/scripts/install-run.js [48:107]

• 49 lines of code
• 12 McCabe index (conditional complexity)

function _trimNpmrcFile(options) {
    const { sourceNpmrcPath, linesToPrepend, linesToAppend } = options;
    const combinedNpmrcFromCache = _combinedNpmrcMap.get(sourceNpmrcPath);
    if (combinedNpmrcFromCache !== undefined) {
        return combinedNpmrcFromCache;
    }
    let npmrcFileLines = [];
    if (linesToPrepend) {
        npmrcFileLines.push(...linesToPrepend);
    }
    if (fs__WEBPACK_IMPORTED_MODULE_0__.existsSync(sourceNpmrcPath)) {
        npmrcFileLines.push(...fs__WEBPACK_IMPORTED_MODULE_0__.readFileSync(sourceNpmrcPath).toString().split('\n'));
    }
    if (linesToAppend) {
        npmrcFileLines.push(...linesToAppend);
    }
    npmrcFileLines = npmrcFileLines.map((line) => (line || '').trim());
    const resultLines = [];
    // This finds environment variable tokens that look like "${VAR_NAME}"
    const expansionRegExp = /\$\{([^\}]+)\}/g;
    // Comment lines start with "#" or ";"
    const commentRegExp = /^\s*[#;]/;
    // Trim out lines that reference environment variables that aren't defined
    for (let line of npmrcFileLines) {
        let lineShouldBeTrimmed = false;
        //remove spaces before or after key and value
        line = line
            .split('=')
            .map((lineToTrim) => lineToTrim.trim())
            .join('=');
        // Ignore comment lines
        if (!commentRegExp.test(line)) {
            const environmentVariables = line.match(expansionRegExp);
            if (environmentVariables) {
                for (const token of environmentVariables) {
                    // Remove the leading "${" and the trailing "}" from the token
                    const environmentVariableName = token.substring(2, token.length - 1);
                    // Is the environment variable defined?
                    if (!process.env[environmentVariableName]) {
                        // No, so trim this line
                        lineShouldBeTrimmed = true;
                        break;
                    }
                }
            }
        }
        if (lineShouldBeTrimmed) {
            // Example output:
            // "; MISSING ENVIRONMENT VARIABLE: //my-registry.com/npm/:_authToken=${MY_AUTH_TOKEN}"
            resultLines.push('; MISSING ENVIRONMENT VARIABLE: ' + line);
        }
        else {
            resultLines.push(line);
        }
    }
    const combinedNpmrc = resultLines.join('\n');
    //save the cache
    _combinedNpmrcMap.set(sourceNpmrcPath, combinedNpmrc);
    return combinedNpmrc;
}